Pertussis toxin and use in vaccines

Abstract

Cloning and sequencing of the Eco RI fragment of B. pertussis chromosomal DNA with 4696 base pairs, containing the genes which code for the five subunits of the pertussis toxin.A hybrid plasmid containing the DNA fragment or its further fragments and a micro-organism transformed by the hybrid plasmid and capable of expressing the cloned DNA fragment or further fragments thereof by synthesis of the pertussis toxin or one or more subunits of the pertussis toxin.The pertussis toxin or one or more subunits of the pertussis toxin so obtained are useful for the preparation of vaccines and diagnostic kits.

Claims

1. Pertussis toxin obtained by chemical synthesis or from microorganisms transformed with molecules of recombinant DNA containing the five genes that code for pertussis toxin, in which the subunits S1, S2, S3 and S4 are characterized by the aminoterminal sequences set forth in FIG. 2.

2. A method for the preparation of anti-pertussis vaccines comprising adding to said vaccines the pertussis toxin produced by chemical synthesis or from microorganisms transformed with molecules of recombinant DNA containing the five genes that code for pertussis toxin.